February 17, 2025

Winter and tree identification leaves me looking at the bark. This is Black Walnut (Juglans nigra), a tree that is quite common here. The tree produces a chemical, juglone, in all its parts.

Juglone creates a toxic reaction in other plants. An example of its effectiveness is at the yoga studio where I hang out. There are perhaps three Black Walnut trees there. Under the trees and in the immediate surrounding area there is only grass, and no other plants or weeds – nothing.

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